Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IA-32 Huge TLB Page Support for Kernel. | |
3 | * | |
4 | * Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com> | |
5 | */ | |
6 | ||
1da177e4 LT |
7 | #include <linux/init.h> |
8 | #include <linux/fs.h> | |
9 | #include <linux/mm.h> | |
10 | #include <linux/hugetlb.h> | |
11 | #include <linux/pagemap.h> | |
1da177e4 LT |
12 | #include <linux/err.h> |
13 | #include <linux/sysctl.h> | |
14 | #include <asm/mman.h> | |
15 | #include <asm/tlb.h> | |
16 | #include <asm/tlbflush.h> | |
a5a19c63 | 17 | #include <asm/pgalloc.h> |
1da177e4 | 18 | |
1da177e4 LT |
19 | #if 0 /* This is just for testing */ |
20 | struct page * | |
21 | follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) | |
22 | { | |
23 | unsigned long start = address; | |
24 | int length = 1; | |
25 | int nr; | |
26 | struct page *page; | |
27 | struct vm_area_struct *vma; | |
28 | ||
29 | vma = find_vma(mm, addr); | |
30 | if (!vma || !is_vm_hugetlb_page(vma)) | |
31 | return ERR_PTR(-EINVAL); | |
32 | ||
33 | pte = huge_pte_offset(mm, address); | |
34 | ||
35 | /* hugetlb should be locked, and hence, prefaulted */ | |
36 | WARN_ON(!pte || pte_none(*pte)); | |
37 | ||
38 | page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)]; | |
39 | ||
25e59881 | 40 | WARN_ON(!PageHead(page)); |
1da177e4 LT |
41 | |
42 | return page; | |
43 | } | |
44 | ||
45 | int pmd_huge(pmd_t pmd) | |
46 | { | |
47 | return 0; | |
48 | } | |
49 | ||
ceb86879 AK |
50 | int pud_huge(pud_t pud) |
51 | { | |
52 | return 0; | |
53 | } | |
54 | ||
1da177e4 LT |
55 | struct page * |
56 | follow_huge_pmd(struct mm_struct *mm, unsigned long address, | |
57 | pmd_t *pmd, int write) | |
58 | { | |
59 | return NULL; | |
60 | } | |
1da177e4 LT |
61 | #else |
62 | ||
63 | struct page * | |
64 | follow_huge_addr(struct mm_struct *mm, unsigned long address, int write) | |
65 | { | |
66 | return ERR_PTR(-EINVAL); | |
67 | } | |
68 | ||
69 | int pmd_huge(pmd_t pmd) | |
70 | { | |
71 | return !!(pmd_val(pmd) & _PAGE_PSE); | |
72 | } | |
73 | ||
ceb86879 AK |
74 | int pud_huge(pud_t pud) |
75 | { | |
39c11e6c | 76 | return !!(pud_val(pud) & _PAGE_PSE); |
ceb86879 | 77 | } |
1da177e4 LT |
78 | #endif |
79 | ||
fd8526ad | 80 | #ifdef CONFIG_HUGETLB_PAGE |
1da177e4 LT |
81 | static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file, |
82 | unsigned long addr, unsigned long len, | |
83 | unsigned long pgoff, unsigned long flags) | |
84 | { | |
39c11e6c | 85 | struct hstate *h = hstate_file(file); |
cdc17344 ML |
86 | struct vm_unmapped_area_info info; |
87 | ||
88 | info.flags = 0; | |
89 | info.length = len; | |
fd8526ad | 90 | info.low_limit = current->mm->mmap_legacy_base; |
cdc17344 ML |
91 | info.high_limit = TASK_SIZE; |
92 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); | |
93 | info.align_offset = 0; | |
94 | return vm_unmapped_area(&info); | |
1da177e4 LT |
95 | } |
96 | ||
97 | static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file, | |
98 | unsigned long addr0, unsigned long len, | |
99 | unsigned long pgoff, unsigned long flags) | |
100 | { | |
39c11e6c | 101 | struct hstate *h = hstate_file(file); |
cdc17344 ML |
102 | struct vm_unmapped_area_info info; |
103 | unsigned long addr; | |
1da177e4 | 104 | |
cdc17344 ML |
105 | info.flags = VM_UNMAPPED_AREA_TOPDOWN; |
106 | info.length = len; | |
107 | info.low_limit = PAGE_SIZE; | |
108 | info.high_limit = current->mm->mmap_base; | |
109 | info.align_mask = PAGE_MASK & ~huge_page_mask(h); | |
110 | info.align_offset = 0; | |
111 | addr = vm_unmapped_area(&info); | |
1da177e4 | 112 | |
1da177e4 LT |
113 | /* |
114 | * A failed mmap() very likely causes application failure, | |
115 | * so fall back to the bottom-up function here. This scenario | |
116 | * can happen with large stack limits and large mmap() | |
117 | * allocations. | |
118 | */ | |
cdc17344 ML |
119 | if (addr & ~PAGE_MASK) { |
120 | VM_BUG_ON(addr != -ENOMEM); | |
121 | info.flags = 0; | |
122 | info.low_limit = TASK_UNMAPPED_BASE; | |
123 | info.high_limit = TASK_SIZE; | |
124 | addr = vm_unmapped_area(&info); | |
125 | } | |
1da177e4 LT |
126 | |
127 | return addr; | |
128 | } | |
129 | ||
130 | unsigned long | |
131 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
132 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
133 | { | |
39c11e6c | 134 | struct hstate *h = hstate_file(file); |
1da177e4 LT |
135 | struct mm_struct *mm = current->mm; |
136 | struct vm_area_struct *vma; | |
137 | ||
39c11e6c | 138 | if (len & ~huge_page_mask(h)) |
1da177e4 LT |
139 | return -EINVAL; |
140 | if (len > TASK_SIZE) | |
141 | return -ENOMEM; | |
142 | ||
5a8130f2 | 143 | if (flags & MAP_FIXED) { |
a5516438 | 144 | if (prepare_hugepage_range(file, addr, len)) |
5a8130f2 BH |
145 | return -EINVAL; |
146 | return addr; | |
147 | } | |
148 | ||
1da177e4 | 149 | if (addr) { |
39c11e6c | 150 | addr = ALIGN(addr, huge_page_size(h)); |
1da177e4 LT |
151 | vma = find_vma(mm, addr); |
152 | if (TASK_SIZE - len >= addr && | |
153 | (!vma || addr + len <= vma->vm_start)) | |
154 | return addr; | |
155 | } | |
156 | if (mm->get_unmapped_area == arch_get_unmapped_area) | |
157 | return hugetlb_get_unmapped_area_bottomup(file, addr, len, | |
158 | pgoff, flags); | |
159 | else | |
160 | return hugetlb_get_unmapped_area_topdown(file, addr, len, | |
161 | pgoff, flags); | |
162 | } | |
fd8526ad | 163 | #endif /* CONFIG_HUGETLB_PAGE */ |
1da177e4 | 164 | |
b4718e62 AK |
165 | #ifdef CONFIG_X86_64 |
166 | static __init int setup_hugepagesz(char *opt) | |
167 | { | |
168 | unsigned long ps = memparse(opt, &opt); | |
169 | if (ps == PMD_SIZE) { | |
170 | hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); | |
171 | } else if (ps == PUD_SIZE && cpu_has_gbpages) { | |
172 | hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); | |
173 | } else { | |
174 | printk(KERN_ERR "hugepagesz: Unsupported page size %lu M\n", | |
175 | ps >> 20); | |
176 | return 0; | |
177 | } | |
178 | return 1; | |
179 | } | |
180 | __setup("hugepagesz=", setup_hugepagesz); | |
181 | #endif |